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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ea959e41bcf94c28e14f69720b2bdf812ab5956b3a152c92f65c465bf03da5' 
  AND token = 'vOq5ScHYsxFhZf5JToYnw58uUy459zngyYqx20PG6LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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