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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf8fbb63b58a7394ced82fde236af551d4c3011b400dffcfb0941b2b74c7d78' 
  AND token = 'eKNu8eNsqtE0qXpwuBElC0J6V0bsqrW6leLbN36yBM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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