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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac06694bc12456ca07ebd3d2a2c7042671a9b4de6861ed164ecfb1168f3ec42' 
  AND token = '+ADcZyk8Ud/CEHT3Y2AakWpADTuOhU89Hq8SUAxaHmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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