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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d6b53a13b90ec188ee913a1fa3a8d7b4346c3d8197e6bf4e5f98f67e8056e8' 
  AND token = 'XLFb70fihUpUoNpbfAcnhCdva5LkpmHyCmmkhSzgNvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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