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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b5bb2194e1e4761f1d0cc970c5c58421e0c7e4c84f6b9d53ea6826a5bd694c' 
  AND token = 'rt+v7nOkYM1wUWNZfq2dqeFedjldIYS0PCESIvlT2/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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