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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c623eaa88f84eb477afc87da8058e5b98310c0c13713695bdbb16b9a379d9' 
  AND token = 'pq37rtlAu/exaSwsd7wyiMgFxMUD7OlQW4achp1v1Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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