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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf150d8c0f30135b6edea7746c4590018aff5dc2ec3611752c9ef6b8b51ac7e' 
  AND token = 'tIN2yiMkl3ERXPsISwH6C0pm5TuxAuMd/stcPyYUk+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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