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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4530fcd8b2e098e2d67f09a8ca774d6c1261ce696a7a41d4807b9615cd402df' 
  AND token = 'tZfP0ipAns6iKcdvqzgF3tqBL4EjxZZxMWKUzA3Zyog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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