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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373c4b8c2d74c30d571783c03b474cb16207778236a16b7b3f766851abea89eb' 
  AND token = '1mvLic23HMFWuuYpH3E7jcoMs5G1oSF41z32HlObMWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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