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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557b1047fcff8ab3cde2e4b430ef5d8a4f0d13dcef2f558e07478888640b9f4d' 
  AND token = '1G0CutFuJGn8suJYsndPD9q3NeqrQXMFrn2ENoPZvwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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