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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd78a08b2ccf8466082e9780694e1caf348e38d0ab503d01fd87f7888013f4cd' 
  AND token = 'P0g1/3EY8lquwTc0yH0yIMMrNjipfVvxwjSKAFAJlr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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