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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199f18876438e379b9e1788d643559ca1c6a5ace1f06411128f84ebe966b2a80' 
  AND token = 'fGaH4OCgh7aaUj2yHgdqh9pU3Nlq02zw4niuCUNfK/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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