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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d986ee1f3b8fe5940fc53b0e781799e156f30acb00944509f8b25ced72d36e6' 
  AND token = '9RrLR9oEM1g40aTxtzGQHKDOmigJ2OLZ+EkzJwAcQM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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