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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf1c702c84b332acfd69a46ea93d635e25b03b1230085188d16c552d3dc0932' 
  AND token = 'YobaY5pXs2HiGwqretcmiWwUF/F5qXgKygKUpo4bsW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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