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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be25f91af00c61098ef817186732714e7f5ab2d45b8c47335b7d622943204bd7' 
  AND token = 'Y7AeuKhKrb5ORC+fFMWN+AcBVVUhNIOTUrex2FiD2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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