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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ca4109e7d8fd375b7a2f7c162c0aab2ace6cb16d14069db884074ee5df8fd6' 
  AND token = '0W4QMZXJECBJ/mitycwm2uiamTbaUHxw6FbAgX5goZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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