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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85599ec68bab8c89f45cdde53b181725a54a238b1d8ab0ef1c431537cc762c2' 
  AND token = 'nypE7VWYWRWR6HP3iqAnHLFj9T+2qVHutB2yDMC9NFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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