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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8cb3512b91cf2b99c0bd9ef2c23bb6a499ca8bc91fa6c4f75df9e0bc2a585f' 
  AND token = 'hfRSMbf2UF0syVwEU6guWOiYvM8atLCvji+eV976QLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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