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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2405f0aaec6ec4375e2fe6267d2ba0bc3b31512e6a7cf3ca14eb55c26cb380' 
  AND token = 'YKWy2iXTDfCFlwUj/3bXalfWrj0VZlosAwrcUa54Awo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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