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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcdd41bfc206f9ee1fa2adf8d676f5840fe1a7a56869a42e787b75d04de9188' 
  AND token = 'n4YluCwTstrIXanTGuDgmPqqymn/TJXRq8oRcswSqvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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