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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd82ed098b729a4ce8fa9b13e24fde622a42c756279da222a5a23b04f453df4' 
  AND token = '12VJfwtZY6qSAS/SbYl1C6s9JMoQBbMgFcNPCIPHBOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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