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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a36089979f32998737eb6f045342cbf655f84a5dec275d53580fe34268834' 
  AND token = 'z7itulaJRoBOt3uQQpN/UH8axuXNS4xi48YeG1+LsHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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