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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f1d3a25045efe22a95e6470ab842432f0dbf91a47ecd530bf2acd2e6d2e54a' 
  AND token = 'JauTRhe5V9HXTMLl6/11Tx/AS1ts3yAmPX4A0sAKY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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