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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55034e7a6303de1b456af33ffea273508e12fe45e02fac660f8d21d96046e3c0' 
  AND token = 'EqCvq0S8jevIrEDkBM6jPHjnN1F/ep6+5xANYuVnMmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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