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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb57b88708b687138226bbb35e62507dc115867f36c27b9d5e582786a3ea6f77' 
  AND token = '7uIhMU573w5FDdmTu4YEJQmO5aXYN4TmWDdCdzIhEQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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