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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99355cd915902be2b970ec5300546c982273811092734c9a4994c7fed7d79d71' 
  AND token = '1G7x5hLbgpfVKAN0Qud18b1+ixGKDWdcvHg/EzEqzsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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