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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add2d175cf31843e96882fb4fdfc0d02035d585d21cc8ab834d253f0449ad963' 
  AND token = 'kdcL8iO+nt5aLXy8/eyNBsgwXfF0Z+OiOx2cH3A0kXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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