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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e9f19c652681be53a675a21edf3c83563925f67721dd9e9cb3433d4fa75991' 
  AND token = 'hX1hXq/55QSBvZ9pYo2TTfoWy4/02skucTY3ednZ6/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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