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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61146b232330aff7c41a5d0a2e2ccf1c0bed4570dd4c310670808a362c9d3288' 
  AND token = 'sUiP4/A6VBO17pdmaky4TG8st4cEsNVQHd4jJ3GA/bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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