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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a17bbc4db117b35b0677949062a819a8cc16e6f8fcf912cf799699090b2013' 
  AND token = '1Et41tR/FuKwo//zX1YxuxTJNdmF5ljaEucYcxy4Nfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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