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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e451fb886b70f7adaab29997d46af36f1a682e6617180038d871480f097214' 
  AND token = 'avbLnBXPdd5Qk26pv3h5Jbhq20RLu+OdN39X6EE0FFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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