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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678d19a2424a09014164ccb9aa51410066c51ac00733b4302db76c3f19d5df79' 
  AND token = '5BFZNNHrWtOjMsifnTcBa2NTSHk8Lj3/zmvHabir3/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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