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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e0d570f70d626a6b1555e22d2e554af59a3abe61c830e9c5dbed18d5e0ef16' 
  AND token = 'YDelBDLCoAgg8jXG3C6yKQbJyRVI+hoeZEyH1r7u+zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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