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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cce896c480e136722f436e379d18f79f7ab84bd3a75457cc6bc1b12abaa3c39' 
  AND token = 'BAh/HPrxZyYQU3/+4WbgHDf7Warv2JXON/eI9OYeUsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}