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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97047da539bae3f63f65d5544689d7b26e6bca379d926b2976b61b8554714ab4' 
  AND token = '3jDCDIvPi7NXaYP+dq59Ul0xi/j1CCLdInrmpXjB2zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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