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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c8934aaf4ed67622983a316e1a7b442d68922d8248dbf8389e1552f27f99e1' 
  AND token = 'vB6UAK37x38XJMWMtGXf0lXJW/yW+5N4vaFyxU10bfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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