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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcaa1abc7242d90379193a0bdaed5b72575f620aec95376a4005eb738d975fe' 
  AND token = 'WIh1Rd5A+2wn9LbGwL7oJ7xHrcv8srczsw4SxrtiQew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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