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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435156569c606103386ecdb8fdd3a35c518bb209b8cb41e3a0af67db8e91c7d0' 
  AND token = '1Waqg/VzNrOkuN1kpVrUSHtiTdWFA8aa7Na9P150HBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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