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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb208c372d200f2f572acdde2c15f98c3ef64e57e8f9efbf7c7c4f9466a1aeb2' 
  AND token = 'esdK0yiHrPa0U0etyk+qJGKKosvFlpVcCLSQufg3X1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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