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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336358ed1b9db868386afa2491a3273e6265d3cc777eaae5566221e2c35b57b6' 
  AND token = 'tWIXg5LZ4Rhxjmvm3bWYdBuoh8ot+8DDiln7kxZPnOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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