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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c39e77e12594b2e403ea65b2ab07ace2e72ca0eb240232d1e7f981621abd98' 
  AND token = '1f7F8cjyDSWz2AUsBh+mGyU6OljUfEyOPWjQxVtWAO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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