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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fbde0ce53991896fa69bba194d38f81754cda15321a7eacc5ebca9a773900c' 
  AND token = 'NtfEix0Z6OW3toHfuuNX3QI59V7D7sZ7U2I6/qslv9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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