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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df516bfa991b8a6474cabc9d3a9e27aff6103234f2b40e1f1bb5b0805fdf1c4d' 
  AND token = 'lUm2kNMIJ6c8lgDxlk5t5WX1Ll622WpQPpVlV2A3Yfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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