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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c02b58380fc80dd4622560e4c1f1f62120015e45c962831897cec8edb02837' 
  AND token = '9F9j4bx9UDLNyIkF32DOzy0S8XZfFAvqdKTQxrCiDKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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