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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ceff7c85d16e3860a239d273ed3dea0289cfa4ef6199013bcc791bef46417f3' 
  AND token = 'p/95g6FZOzRamWMce9u4T7VJH0mgFoZqyyZHp2AkN4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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