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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09048774466e60d2812b14af35f819dadb5b792b3a997ae2adecd7e4c9dd0f1e' 
  AND token = 'hIv94ynk4AO52g8oBYK8wY8xstQRoI9dcppMgLKovTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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