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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7161c910cc44c2a2ff573d755d345e4b656f1cb7569d5d7206ef1789d6620128' 
  AND token = 'z75Or0MeN5QUovcT5itz3iu0QupxkOqOWGTHvdziuV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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