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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4648f6542028b333fbf10e3db6c9bb3fef4a4591bd6ff6178a3d7dcb8d2bfdfa' 
  AND token = '69MKSXQZ5veGCqS7wnwFSO3sDFQqpg55dy6ROSytO8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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